If we have no idea how loose/aggro he is, making assumptions about his capability to raise with worse hands is debatable. If there's any chance he's just an usual fish - playing for stacks is fine as he may have worse Qx/draws. Against nitty/passive players I tend to see sets/combo draws too often against which you are far from being favourite, but I assume there will be enough bad players out there to justify times when this unknown turns out to be passive nit.